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Posted: 9/25/2017 12:23:12 PM EDT
 Attached FileFirst two rounds shot semi-automatically:  Attached FileFirst 15:  Attached File29 loaded up to go:  Attached File49 FN 40 grn Hornady varmint rounds fired, 0 malfunctions:  Attached FileRelevant parts: Trigger jig from eBay - my apologies for ARFCOM selling your information: http://www.ebay.com/itm/223-5-56-Trigger-Test-Jig-Fixture-Gunsmith-tool-Gunsmithing-154-pins-Fine-Grip/271843743803 Or a broken link, just copy & take out the space: www.e bay.com/itm/223-5-56-Trigger-Test-Jig-Fixture-Gunsmith-tool-Gunsmithing-154-pins-Fine-Grip/271843743803 
The Hera Arms CQB thumbhole stock: http://gnarlygorilla.com/hera-usa-cqr-stock-ar-15-replacement-fixed-stock-mil-spec-polymer-od-green 
The AR57 5.7x28mm upper: http://www.classicfirearms.com/ar-57-upper-001-slc16-mlok 
The takedown pin, available from the original Cavalry Manufacturing, inventor of the near-indestructable Cav Arms Mk2, now made by GWACS: http://www.cavmfg.com/CAV-15-MKII-Take-Down-Pins-CAVTDP.htm 
You'll also need a hacksaw or a Dremel, to whack off enough off the back of the trigger jig to fit the stock. Original thread, covering installation of the Hera CQB stock, and test firing of the auto eject uppers. http://www.ar15.com/forums/ar-15/-ARCHIVED-THREAD-Master-Lyndon-build-thread-trigger-jig-thumbhole-stock-223-upper-test-fired-27-May/121-709384/ Pistol entering testing soon. Parts are here!  Attached File |
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Posted: 9/15/2017 10:42:41 PM EDT
[#1]
Who did that?
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Posted: 9/16/2017 12:03:09 AM EDT
[#2]
Yours truly. Sliced off the back of the trigger jig to fit in the stock.
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Posted: 9/16/2017 12:07:14 AM EDT
[#3]
what am I looking at?
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Posted: 9/16/2017 12:11:06 AM EDT
[#4]
A semi-auto Lyndon with a 50 round clip, a shoulder thing that goes up, some terrible Dremeling, and no serial number.
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Posted: 9/16/2017 12:11:42 AM EDT
[#5]
Quote HistoryQuoted:
what am I looking at? 
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Posted: 9/25/2017 9:12:47 AM EDT
[#6]
Off topic.
This is not General Discussion. AeroE |
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Posted: 9/25/2017 10:47:17 AM EDT
[#7]
Quote HistoryQuoted: 223 5.56 Trigger Test Fixture AR Style Gunsmithing tool for .154" pins. It looks like they used Trigger Test Fixture not cut up a lower. AR5.7 upper & the Stock is holding buffertube. Drilled hole for Takedown pin & dremel for grips bevertail. You could mount(bolt or screw) a second endplate to the Trigger Fixture to help hold the buffertube if it needed more support.
https://cdn3.volusion.com/jbmff.rawwc/v/vspfiles/photos/SD20-179-5.jpg?1399841119 |
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Posted: 9/25/2017 12:21:29 PM EDT
[#8]
In case anyone is not clear, this is a technical forum. All forums except General Discussion are technical forums.
I can't decide if this thread is out of place, but I'm leaning that way. I can move it to GD or AR Variants, or Build It Yourself. |
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Posted: 9/25/2017 5:54:28 PM EDT
[#9]
Your call. This is a perfectly good spot. Only metalworking was shaving off the back of the trigger jig - which I did with a Dremel, poorly.
Hoping to run 100 rounds through it Thursday w/ my BIL & FIL. |
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Posted: 9/25/2017 8:44:33 PM EDT
[#10]
It certainly is BIY! I got one like seeing this stuff. I'd rather stay out of GD to do so.
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Posted: 9/25/2017 9:48:25 PM EDT
[#11]
@ roughly $800, it's about twice the price of 2 entry level ARs; but there's no serial number, anyone who can work a hacksaw or a Dremel can make it - it's a single cut across the back of the trigger jig, and presto chango, you've got a 50 shot semi-auto rifle.
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Posted: 9/26/2017 2:14:36 AM EDT
[#12]
Shhh... before the ATF arbitrarily decides that the trigger jig is now a firearm...
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Posted: 9/26/2017 2:32:05 AM EDT
[#13]
Backbencher I got you beat like a rented mule in the dremel dept.
Still excited to see you fire that 
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Posted: 9/26/2017 9:18:09 AM EDT
[#14]
Quote HistoryQuoted:
Shhh... before the ATF arbitrarily decides that the trigger jig is now a firearm... |
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Posted: 9/26/2017 9:30:36 AM EDT
[#15]
Tagging for AAR.
Neat concept! |
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Posted: 9/26/2017 10:22:44 AM EDT
[#16]
we dont need no sinking lower
let us know how it functions. |
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Posted: 9/26/2017 11:05:25 AM EDT
[#17]
Quote HistoryQuoted:
hence my deleted ATF meme |
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Posted: 9/26/2017 7:45:16 PM EDT
[#18]
Ok, laugh all you want, but how do you load the magazine?
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Posted: 9/26/2017 7:52:02 PM EDT
[#19]
Ok, figgered it out. The whole 90 degree turn thing threw me.
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Posted: 9/26/2017 10:39:32 PM EDT
[#20]
I like it. Probably would have gone for one of those slidefire stocks before the Cali derpy derp stock.
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Posted: 9/26/2017 10:59:15 PM EDT
[#21]
Quote HistoryQuoted: I like it. Probably would have gone for one of those slidefire stocks before the Cali derpy derp stock. |
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Posted: 9/27/2017 7:28:29 PM EDT
[#22]
Bump. D-1. The little screws that hold the pistol grip adapter to the trigger jig have been Loctited.
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Posted: 9/28/2017 8:27:08 AM EDT
[#23]
I used a dremel a little on this one
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Posted: 9/28/2017 1:25:45 PM EDT
[#24]
interesting concept. I too think there has to be a way to reinforce the buffer tube. Maybe take a demilled back end from a lower, machine it out to mate to the trigger system. add a couple pins, maybe do some AL welding. no serial, no loss of a real lower?
I like the concept! |
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Posted: 9/28/2017 2:59:33 PM EDT
[#25]
Quote HistoryQuoted:
interesting concept. I too think there has to be a way to reinforce the buffer tube. Maybe take a demilled back end from a lower, machine it out to mate to the trigger system. add a couple pins, maybe do some AL welding. no serial, no loss of a real lower? I like the concept! |
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Posted: 9/28/2017 4:10:25 PM EDT
[#26]
Turns out all it needs is a zip tie from the bottom of the trigger jig and over the top of the Picatinny rail.
99 rounds fired, no malfunctions. American Eagle groups a little down and to the left from the FN Hornady. 50 American Eagles loaded up, ready to go:  Attached FileReally - 50:  Attached FileAnd 50 spent cases, after zero malfunctions:  Attached FileTook me a while to zero:  Attached FileCan you tell I have astigmatism? Seems the American Eagle was a bit less precise than the FN ammo, and grouped lower and to the left a bit. The handguard close to the chamber got uncomfortably warm about halfway through the magazine:  Attached File |
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Posted: 9/28/2017 6:53:07 PM EDT
[#27]
That's innovative...
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Posted: 9/28/2017 10:05:13 PM EDT
[#28]
Nice.
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Posted: 9/28/2017 10:17:36 PM EDT
[#29]
Glad to see it works. I wonder how a Larue TAC would work for holding the FCG.
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Posted: 9/28/2017 10:30:38 PM EDT
[#30]
How is the magazine attached to the gun? Duck tape?
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Posted: 9/28/2017 10:31:51 PM EDT
[#31]
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Posted: 9/28/2017 10:32:48 PM EDT
[#32]
Quote HistoryQuoted:
How is the magazine attached to the gun? Duck tape? |
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Posted: 9/28/2017 10:55:33 PM EDT
[#33]
Quote HistoryQuoted: Glad to see it works. I wonder how a Larue TAC would work for holding the FCG. 
@LaRue_Tactical jaqufrost, I've ordered your eBay jig, now I have to hunt down the compliance adapter to build the pistol. It's gonna have the "non-pistol grip" pistol grip shape, IIRC. One of us should modify the compliance part instead of the jig. It would be hilarious if we could build a pistol that takes down into a collection of non-pistol parts. It might be possible to do that w/ the rifle configuration by modifying a Hera Arms compliance stock that comes w/o the thumbhole - it should actually be stronger than the CQB I used, and in a free state you can still cut a thumbhole into it. |
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Posted: 9/28/2017 11:07:30 PM EDT
[#34]
This was a long time coming, but I'm happy you stuck to the vision. Congratulations. Not a practical route to a gun for most people ($$$, for one thing), but counterexamples to stupid laws don't need to be practical to prove a point, and this does. First they came for our 3D printers, then they came for our trigger jigs . . .
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Posted: 9/28/2017 11:55:01 PM EDT
[#35]
I would've called it the ghetto-fender 57
Interesting how that trigger housing is made in CA. Why does it have the rear takedown pin drilled? I don't think you're able to attach an upper because of the rubber stopper. |
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Posted: 9/29/2017 12:13:22 AM EDT
[#36]
Quote HistoryQuoted: I would've called it the ghetto-fender 57
Interesting how that trigger housing is made in CA. Why does it have the rear takedown pin drilled? I don't think you're able to attach an upper because of the rubber stopper. I imagine they drilled the rear takedown pin hole so you can make sure your hammer is correctly contacting the firing pin when you use a short hammer, or to make sure your hammer isn't catching on a bolt that isn't shaped properly for it, as in some 9x19mm bolts. Fortunately, the rubber stopper unscrews, and I was able to screw it onto the bottom of the jig, in order to keep the zip ties from sliding off. One thing I kinda forgot - the charging handle. If you mount the zip ties too far forward, it becomes impossible to charge the rifle. Charging the rifle presses the zip ties against the top of the trigger, so when charging a live round, it is imperative you've put the safety on first. This is not a weapon that any manufacturer would produce - safety is on you. jaqufrost, ordered us a pair of right handed Ledge Grips - one tan, one black. Just let me know which color you want. If anyone else wants to join us in the Lyndon pistol trials: http://www.thefirearmblog.com/blog/2017/09/07/ledgegrip-featureless-grip-ca-ar-15s http://www.bande3d.com/ledgegrip-product-page 
Yes, they're hideous. I take special delight in using DPRK compliance parts to build an unserialized pistol. |
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Posted: 9/29/2017 12:56:24 AM EDT
[#37]
Quote HistoryQuoted:
Lyndon Baines Johnson was a President who was fond of serial numbers. I am not so fond of him. I imagine they drilled the rear takedown pin hole so you can make sure your hammer is correctly contacting the firing pin when you use a short hammer, or to make sure your hammer isn't catching on a bolt that isn't shaped properly for it, as in some 9x19mm bolts. Fortunately, the rubber stopper unscrews, and I was able to screw it onto the bottom of the jig, in order to keep the zip ties from sliding off. One thing I kinda forgot - the charging handle. If you mount the zip ties too far forward, it becomes impossible to charge the rifle. Charging the rifle presses the zip ties against the top of the trigger, so when charging a live round, it is imperative you've put the safety on first. This is not a weapon that any manufacturer would produce - safety is on you. jaqufrost, ordered us a pair of right handed Ledge Grips - one tan, one black. Just let me know which color you want. If anyone else wants to join us in the Lyndon pistol trials: http://www.thefirearmblog.com/blog/2017/09/07/ledgegrip-featureless-grip-ca-ar-15s http://www.bande3d.com/ledgegrip-product-page http://www.thefirearmblog.com/blog/wp-content/uploads/2017/09/18077425_255771948220615_8695223525256102768_o-660x371.jpg Yes, they're hideous. I take special delight in using DPRK compliance parts to build an unserialized pistol. It's also interesting that they added a portion to prevent the stock from teloscoping. I don't know how well that would be defined as a "fixed stock" in Calis eyes, as you can still remove the stock without the use of tools, and so far there hasn't been anyone to test that portion of the law. |
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Posted: 9/29/2017 1:03:38 AM EDT
[#38]
Quote HistoryQuoted: Interesting , I've found those grips with weird angles awkward. To me it doesn't feel like you're holding the rifle in any secure fashion. I know most of the are to mimic the feel of a hunting stock, but with a hunting stock I can still wrap my thumb around it to get a secure hold...
It's also interesting that they added a portion to prevent the stock from teloscoping. I don't know how well that would be defined as a "fixed stock" in Calis eyes, as you can still remove the stock without the use of tools, and so far there hasn't been anyone to test that portion of the law. The grip angle is certainly awkward. I'm only interested in this grip, b/c like the Hera Arms CQB, it will hold the buffer tube for us, even if we have to glue it down. It also lowers the price on the grip, @ half the price of the Hera, and allows folks w/ SBR 57 uppers to play. |
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Posted: 9/29/2017 10:47:59 AM EDT
[#39]
Ok, you got me interested. IN!
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Posted: 9/29/2017 3:44:47 PM EDT
[#40]
Anybody have a beltfed upper or one of those 50BMG ones where the magazine inserts into the side? That'd be pretty funny to get working on this "lower".
I do have a pile of the LaRue MBT trigger jig thingies here. But I don't own any uppers that will work because they all want the magazines locked into the lower. |
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Posted: 9/29/2017 4:11:50 PM EDT
[#41]
You can shoot your uppers as a single shot self ejector.
ETA: If you have a .22" LR upper, you make a single shot .22" LR pistol that self-ejects w/ a regular pistol grip. |
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Posted: 9/29/2017 6:08:10 PM EDT
[#42]
this seems like the single best application for a 3d printer in the gun world. someone GET THE FUCK on this.
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Posted: 9/29/2017 6:55:25 PM EDT
[#43]
The original thread, now archived - covers the installation of the stock - helpful to anyone w/ a Hera CQB stock, cutting of the trigger jig, and test firing of the auto eject uppers.
http://www.ar15.com/forums/ar-15/-ARCHIVED-THREAD-Master-Lyndon-build-thread-trigger-jig-thumbhole-stock-223-upper-test-fired-27-May/121-709384/ |
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Posted: 9/29/2017 10:23:14 PM EDT
[#44]
Quote HistoryQuoted:
this seems like the single best application for a 3d printer in the gun world. someone GET THE FUCK on this. |
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Posted: 9/29/2017 10:54:25 PM EDT
[#45]
Quote HistoryQuoted: Anybody have a beltfed upper or one of those 50BMG ones where the magazine inserts into the side? That'd be pretty funny to get working on this "lower".
I do have a pile of the LaRue MBT trigger jig thingies here. But I don't own any uppers that will work because they all want the magazines locked into the lower. |
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Posted: 9/30/2017 11:45:49 AM EDT
[#46]
 I found this:
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Posted: 9/30/2017 5:51:14 PM EDT
[#47]
Want. Link?
That looks like it's already a lower for something w/ the sn on the upper. That might make this child's play.. |
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Posted: 9/30/2017 5:57:21 PM EDT
[#48]
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Posted: 9/30/2017 6:04:13 PM EDT
[#49]
https://www.greenswamptactical.com/collections/firearms/products/generic-fire-control-group
Chop off the front and we're in business. You could cut a slot in the front for ejection, and then make you an extension that tied into the front lugs. That's a damn good find. Thanks. |
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Posted: 10/2/2017 7:25:31 PM EDT
[#50]
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Attached File